黑色金属
Ferrous metal
Ferrous metals refer to iron, manganese, chromium and alloys
有色金属
Non-ferrous metal
Nonferrous metals are non-ferrous metals
石油沥青
Petroleum pitch
Petroleum asphalt is a product of crude oil processing
锌铝镁钢边框
Zinc-aluminum-magnesium steel frame
Zinc aluminum magnesium steel frame is made of zinc aluminum magnesium material
新型不锈钢模板
New stainless steel stencil
The new stainless steel stencil is made of self-developed materials
新型不锈钢幕墙
New stainless steel curtain wall
The new stainless steel curtain wall is made of self-developed materials
